US20020189725A1 - Method for producing an aluminium strip for lithographic printing plates - Google Patents

Method for producing an aluminium strip for lithographic printing plates Download PDF

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Publication number
US20020189725A1
US20020189725A1 US10/149,420 US14942002A US2002189725A1 US 20020189725 A1 US20020189725 A1 US 20020189725A1 US 14942002 A US14942002 A US 14942002A US 2002189725 A1 US2002189725 A1 US 2002189725A1
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US
United States
Prior art keywords
strip
thickness
rolled
cast
process according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US10/149,420
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English (en)
Inventor
Gunther Hollrigl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
3A Composites International AG
Original Assignee
Alcan Technology and Management Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alcan Technology and Management Ltd filed Critical Alcan Technology and Management Ltd
Assigned to ALCAN TECHNOLOGY & MANAGEMENT LTD. reassignment ALCAN TECHNOLOGY & MANAGEMENT LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HOLLRIGL, GUNTHER
Publication of US20020189725A1 publication Critical patent/US20020189725A1/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N1/00—Printing plates or foils; Materials therefor
    • B41N1/04—Printing plates or foils; Materials therefor metallic
    • B41N1/08—Printing plates or foils; Materials therefor metallic for lithographic printing
    • B41N1/083—Printing plates or foils; Materials therefor metallic for lithographic printing made of aluminium or aluminium alloys or having such surface layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B21B3/003—Rolling non-ferrous metals immediately subsequent to continuous casting, i.e. in-line rolling
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B21B2003/001—Aluminium or its alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N3/00—Preparing for use and conserving printing surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N3/00—Preparing for use and conserving printing surfaces
    • B41N3/04—Graining or abrasion by mechanical means

Definitions

  • the invention relates to a process for manufacturing a strip of aluminium or an aluminium alloy for electrolytically roughened lithographic printing plates, whereby the metal is continuously cast to strip form and the cast strip is subsequently cold rolled to final thickness (d e ). Also within the scope of the invention are litho-graphic printing plates with electrolytically roughened surface.
  • Lithographic plates of aluminium which are typically about 0.3 mm thick, exhibit advantages over plates made of other materials—of which only some are mentioned here viz.:
  • EP-A-0 821 074 a process for manufacturing an aluminium strip for lithographic plates is described whereby the metal is continuously cast in the roll gap between cooled rolls of a strip casting machine and then rolled to final thickness without intermediate annealing.
  • the specifications for lithographic sheets state maximum values for strength which can be achieved without intermediate annealing only when the thickness of the cast strip is much less than 3 mm. In practice, however, with conventional strip casting machines such small thicknesses of cast strip are not easy to produce with good quality.
  • EP-A-0 653 497 is a process for manufacturing an aluminium strip for lithographic printing plates in which first a cast strip of maximum thickness 3mm is likewise produced using a roll caster.
  • the cast strip is subjected to an intermediate, recrystallising anneal during cold rolling. This anneal is carried out—at a temperature of at least 300° C. and a heating up of at least 1° C./sec—stationary in coil form in a furnace, preferably at temperatures of 400 to 550° C. in a continuous anneal furnace. After this anneal the cast strip is cold rolled directly to a final thickness of 0.5 mm.
  • the object of the present invention is to provide a process of the kind described at the start which, without costly equipment, results in a lithographic strip with good strength also after a stove-lacquering cycle on lithographic printing plate manufactured from the strip.
  • the expression “Without further heating” means that, between the point of leaving the roll gap of the casting machine and rolling to intermediate thickness, the cast strip receives no further external heating. If the cast strip, which after leaving the roll gap of the casting machine still exhibits a relatively high temperature for a certain length of time, is rolled to intermediate thickness shortly after casting, then the starting temperature for rolling, especially for large strip thicknesses, can be increased. For low strip thicknesses the processing to intermediate thickness corresponds to cold rolling.
  • the essential aspect of the process according to the invention lies in the intermediate annealing which serves the purpose of achieving recovery in the structure and not the creation of new grains as is the case with the normal recrystallisation intermediate annealing according to the state-of-the-art procedures.
  • Aluminium strips subjected to the annealing treatment according to the invention undergo a smaller loss in strength after a stove lacquer cycle than strips that have been subjected to a recrystallising anneal.
  • the metal is preferably cast with a maximum thickness of 3.5 mm, in particular 2.0 to 3.0 mm, advantageously 2.4 to 2.8 mm.
  • the cast strip obtains thus an ideal microstructure in a region close to the surface which, in combination with the recovery anneal according to the invention, results in strip rolled to final thickness with a surface structure exhibiting excellent etching behaviour.
  • any strip casting method may be employed to produce the cast strip, whereby, ideally rapid solidification accompanied by warm forming in the roll gap is desired.
  • Both of the properties just mentioned are achieved e.g. by the roll-casting process in which the metal is cast into strip form between cooled rolls.
  • the advantageous structure of the strip near the surface is retained due to rapid solidification.
  • the continuous casting method enables, at the same time, high solidification rates and very fine grain sizes in the regions close to the surface as a result of dynamic recovery immediately after the cast strip emerges from the roll gap of the casting machine.
  • the further processing of the cast strip takes place by winding the cast strip into a coil of the desired size.
  • the strip is rolled to the desired intermediate thickness in a cold rolling mill suitable for lithographic sheet, and after the recovery anneal rolled to final thickness in the normal range of about 150 to 300 ⁇ m.
  • the intermediate thickness at which the recovery anneal is carried out, the temperature and the duration of annealing is selected on the one hand with respect to the initial thickness of the cast strip and on the other hand with respect to the composition of the material being processed.
  • the cast strip is preferably rolled to an intermediate thickness corresponding to at least 50% of the total reduction in thickness, whereby the suitable intermediate thickness is approximately 1.0 to 1.6 mm.
  • the recovery anneal of the material rolled to intermediate thickness preferably lies in a temperature range of 260° C. to 300° C., usefully in a temperature range of about 270 to 290° C., whereby the strip rolled to intermediate thickness is annealed for a duration of about 2 to 5 h.
  • a strip processed according to the invention exhibits excellent mechanical properties e.g. a high strength which falls only slightly during the stoving of a photosensitive lacquer during the production of lithographic plates.
  • the strip manufactured according to the invention is equally suitable for etching in HCI and HNO 3 electrolytes, whereby the advantages of the microstructure achieved stand out especially when etching in an HNO 3 electrolyte.
  • All aluminium alloys used for the production of lithographic printing plates may be employed for manufacturing the lithographic strip according to the invention.
  • alloys from the following series viz., AA 1xxx, AA 3xxx or AA 8xxx for example the alloys AA 1050, AA 1200 or AA 3103.
  • the above mentioned advantageous microstructure in the region close to the surface of the strip is essentially the result of rapid solidification at the surface.
  • the secondary phase particles precipitate out in the microstructure in a very fine form and high density .
  • These particles act as first sites to be attacked on etching, in particular if the electrolytic roughening is carried out in an HNO 3 electrolyte.
  • the above mentioned particles exhibit an average spacing of less than 5 ⁇ m and form an interconnected network of uniform points that are attacked on the surface.
  • the actual three-dimensional roughness pattern begins to grow, starting from this first, very dense points of attack that are distributed uniformly over the whole surface of the strip.
  • the small size of the above mentioned intermetallic phases has the further advantage that the time require for the electrolytic dissolution at the start of etching is considerably reduced, with the result that electrical energy can be saved.
  • the rapid solidification in the surface region non-equilibrium phases are formed by preference; the dissolution rate of these fine particles is high.
  • a further important microstructural feature of the strip manufactured according to the invention is the small grain size which is produced in the surface region during strip casting.
  • etching is performed in a nitric acid electrolyte, it is found in practice that a uniform etch pattern is obtained only if certain etching parameters are observed. If e.g. for reasons of costs too low a charge (Coulomb) is employed, the etch pattern is usually irregular—in the form of streaks where no etching has taken place. If etching is carried out under these critical conditions, all the fine differences in the grain structure of the substrate (lithographic strip) become evident and it is possible to classify the lithographic material used.
  • the strip manufactured according to the invention exhibits the advantage over strip material which has undergone a recrystallisation anneal, in particular in the case of lithographic printing plates after a stove-lacquer cycle at temperatures in the range of approx. 270 to 300° C.
  • the starting material for the investigations was a 4.5 mm thick strip produced on a roll caster machine. This strip was cold rolled to an intermediate thickness of 1.5 mm and after intermediate annealing, cold rolled further to a final thickness of 0.28 mm
  • the details of temperature and duration refer to the metal temperature and duration of annealing after the strip has been heated with a heating rate of 100° C. to the annealing temperature.
  • the strength at failure (Rm) was taken as the strength characteristic.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Metal Rolling (AREA)
  • Continuous Casting (AREA)
US10/149,420 1999-12-23 2000-12-13 Method for producing an aluminium strip for lithographic printing plates Abandoned US20020189725A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE99811203.1 1999-12-23
EP99811203A EP1110631A1 (de) 1999-12-23 1999-12-23 Verfahren zur Herstellung eines Aluminiumbandes for lithographische Druckplatten

Publications (1)

Publication Number Publication Date
US20020189725A1 true US20020189725A1 (en) 2002-12-19

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Family Applications (1)

Application Number Title Priority Date Filing Date
US10/149,420 Abandoned US20020189725A1 (en) 1999-12-23 2000-12-13 Method for producing an aluminium strip for lithographic printing plates

Country Status (8)

Country Link
US (1) US20020189725A1 (de)
EP (1) EP1110631A1 (de)
JP (1) JP2003518554A (de)
AU (1) AU1863501A (de)
CA (1) CA2395166A1 (de)
HU (1) HUP0203748A2 (de)
NO (1) NO20023046L (de)
WO (1) WO2001047649A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113770180A (zh) * 2021-08-19 2021-12-10 山东理工大学 一种细化7000系铝合金厚板晶粒的热轧方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5456772A (en) * 1992-11-20 1995-10-10 Fuji Photo Film Co., Ltd. Support for a planographic printing plate and method for producing same
US5531840A (en) * 1993-11-15 1996-07-02 Fuji Photo Film Co., Ltd. Method of producing support for planographic printing plate
US5762729A (en) * 1993-08-31 1998-06-09 Nippon Light Metal Company Ltd. Aluminum alloy substrate for lithographic printing plate and process of producing same

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0821074A1 (de) * 1996-07-25 1998-01-28 Alusuisse Technology & Management AG Verfahren zur Herstellung eines Bandes aus einer Aluminiumlegierung für lithographische Druckplatten

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5456772A (en) * 1992-11-20 1995-10-10 Fuji Photo Film Co., Ltd. Support for a planographic printing plate and method for producing same
US5547522A (en) * 1992-11-20 1996-08-20 Fuji Photo Film Co., Ltd. Support for a planographic printing plate and method for producing same
US5762729A (en) * 1993-08-31 1998-06-09 Nippon Light Metal Company Ltd. Aluminum alloy substrate for lithographic printing plate and process of producing same
US5531840A (en) * 1993-11-15 1996-07-02 Fuji Photo Film Co., Ltd. Method of producing support for planographic printing plate

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113770180A (zh) * 2021-08-19 2021-12-10 山东理工大学 一种细化7000系铝合金厚板晶粒的热轧方法

Also Published As

Publication number Publication date
HUP0203748A2 (en) 2003-03-28
CA2395166A1 (en) 2001-07-05
NO20023046L (no) 2002-07-01
JP2003518554A (ja) 2003-06-10
AU1863501A (en) 2001-07-09
NO20023046D0 (no) 2002-06-21
EP1110631A1 (de) 2001-06-27
WO2001047649A1 (de) 2001-07-05

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Date Code Title Description
AS Assignment

Owner name: ALCAN TECHNOLOGY & MANAGEMENT LTD., SWITZERLAND

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HOLLRIGL, GUNTHER;REEL/FRAME:013167/0545

Effective date: 20020604

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO PAY ISSUE FEE